Never seen a cotton wool sky before. If it were me, I would clone out (perhaps tone down) the lights that are to the side of the image because they tend to drag the eye out of the composition. The lights in the centre take your eye through to the BG and so I would tend to leave them.
I'd be tempted to give the building a bit more exposure, but there are already halos there. I agree with eliminating the lights to the bottom left perhaps by cloning which would get rid of a bit of street furniture which isn't adding to the image.